Question

a) Draw a neat and labelled diagram to show the following activity.
1) Action of dilute hydrochloric acid on sodium bicarbonate
ii) Name the gas evolved and how will you test the gas evolved and also give the
chemical equations involved in the reaction.​

Answer 1

1. Dilute hydrochloric acid is a strong acid whereas sodium bicarbonate is a weak base. Hence, the acid and base react and undergo neutralization reaction to give salt, carbon dioxide and water as the final product. The chemical equation involved is : HCl + NaHCO₃ → NaCl + H₂O + CO₂.
2. The gas evolved is carbon dioxide, i.e. CO₂. It can be tested by bringing a lighted candle close to the mouth of the vessel in which the reaction is carried out. If the candle blows off, it is an indicator that carbon dioxide is released as a by-product.